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相关概念视频

Radiation: Applications01:17

Radiation: Applications

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
3.3K
Mechanism of heat transfer01:19

Mechanism of heat transfer

1.3K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

380
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
380
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

4.4K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
4.4K
Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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相关实验视频

Updated: Jul 28, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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辐射冷却中的光子结构.

Minjae Lee1,2, Gwansik Kim3, Yeongju Jung1

  • 1Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea.

Light, science & applications
|June 1, 2023
PubMed
概括
此摘要是机器生成的。

辐射冷却为传统冷却提供了一个被动的,没有能源的替代方案. 光子技术的进步现在使得日间有效的辐射冷却能够用于各种应用.

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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相关实验视频

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科学领域:

  • 热力学是一种热力学.
  • 光学是什么?光学是什么?光学是什么?
  • 材料科学 材料科学 材料科学

背景情况:

  • 传统的冷却系统消耗能量,并导致浪费热量.
  • 以前的辐射冷却方法主要局限于夜间应用.
  • 光子技术使辐射冷却性能取得了显著的进步.

研究的目的:

  • 审查辐射冷却的基本热力学原理.
  • 讨论各种光子结构和用于增强辐射冷却的设计策略.
  • 总结辐射冷却技术的商业应用和未来前景.

主要方法:

  • 对辐射冷却相关的热力学传热原理的审查.
  • 分析光子结构,包括多层,周期和随机设计.
  • 讨论光子集成用于高级功能,如彩色和可切换冷却.

主要成果:

  • 演示宽带和选择性中红外辐射,具有高太阳反射率.
  • 发展光子集成以提高辐射冷却效率.
  • 识别各种商业应用,从汽车到个人热调节.

结论:

  • 辐射冷却,特别是随着光子的进步,提供了一个可行的被动冷却解决方案.
  • 光子集成解锁了新的功能,并扩大了辐射冷却的适用性.
  • 未来的研究应该解决新出现的问题,以进一步优化辐射冷却技术.